diff --git a/s3tc.cpp b/s3tc.cpp
index f2642fc..88ea870 100644
--- a/s3tc.cpp
+++ b/s3tc.cpp
@@ -83,7 +83,7 @@ void DecompressBlockDXT1(uint32_t x, uint32_t y, uint32_t width, const uint8_t *
                         finalColor = PackRGBA((r0+r1)/2, (g0+g1)/2, (b0+b1)/2, 255);
                         break;
                     case 3:
-                        finalColor = PackRGBA(0, 0, 0, 255);
+                        finalColor = PackRGBA(0, 0, 0, 0);
                         break;
                 }
             }